Accession Number : AD1013475


Title :   Theory of a Nearly Two-Dimensional Dipolar Bose Gas


Descriptive Note : Technical Report


Corporate Author : NAVAL ACADEMY ANNAPOLIS MD ANNAPOLIS United States


Personal Author(s) : Woulfe,Michael A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1013475.pdf


Report Date : 11 May 2016


Pagination or Media Count : 59


Abstract : This project develops a theoretical model for gases of bosonic atoms at ultracold, but finite temperatures. Under these circumstances, the gas can undergo a phase transition to a purely quantum mechanical state, a Bose-Einstein condensate (BEC), where the atoms cease to behave like distinguishable entities, and instead form a single macroscopic matter wave. At exactly zero temperature, all of the atoms occupy the BEC; at finite temperatures, a significant fraction of the atoms leave the BEC and form a thermal cloud. Thus, the state of a low, but finite-temperature gas of bosonic atoms involves the coexistence of a BEC and a thermal cloud. Further, the atoms can interact in a variety of different ways, which have important consequences for the state of the gas. We consider both short range contact interactions and dipolar interactions, where the atoms interact via the long-range, anisotropic dipole-dipole force. We develop this model in both three- and two-dimensional geometries.


Descriptors :   bose einstein condensates , critical temperature , phase transformations , quantum properties , dipole moments , quantum statistical mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE